The first enantioselective Michael addition of alpha-cyanoketones to alpha,beta-unsaturated trifluoromethyl ketones using a novel piperazine-thiourea catalyst was described. The resulting alpha-trifluoromethyldihydropyrans were obtained in high yields and with up to 95% ee within a short reaction time. A useful transformation of the chiral adduct was also illustrated.
Tandem sequential catalytic enantioselective synthesis of highly-functionalised tetrahydroindolizine derivatives
作者:Shuyue Zhang、Mark D. Greenhalgh、Alexandra M. Z. Slawin、Andrew D. Smith
DOI:10.1039/d0sc00432d
日期:——
An isothiourea-catalysed enantioselectivesynthesis of novel tetrahydroindolizine derivatives is reported through a one-pot tandem sequential process. The application of 2-(pyrrol-1-yl)acetic acid in combination with either a trifluoromethyl enone or an α-keto-β,γ-unsaturated ester in an enantioselective Michael addition–lactonisation process, followed by in situ ring-opening and cyclisation, led to
Enantio- and Diastereoselective Formal Hetero-Diels-Alder Reactions of Trifluoromethylated Enones Catalyzed by Chiral Primary Amines
作者:Yong-Jun Lin、Li-Na Du、Tai-Ran Kang、Quan-Zhong Liu、Ze-Qin Chen、Long He
DOI:10.1002/chem.201501897
日期:2015.8.10
Enantioselective formal hetero‐Diels‐Alderreactions of trifluoromethylated enones and 2‐amino‐1,3‐butadienes generated in situ from aliphatic acyclic enones and chiral primary amines are reported. The corresponding tetrahydropyran‐4‐ones are formed in up to 94 % yield and with up to 94 % ee. The reaction was carried out through a stepwise mechanism, including initial aminocatalytic aldol condensation
Reactions of CF<sub>3</sub>-enones with arenes under superelectrophilic activation: a pathway to trans-1,3-diaryl-1-CF<sub>3</sub>-indanes, new cannabinoid receptor ligands
作者:Roman O. Iakovenko、Anna N. Kazakova、Vasiliy M. Muzalevskiy、Alexander Yu. Ivanov、Irina A. Boyarskaya、Andrea Chicca、Vanessa Petrucci、Jürg Gertsch、Mikhail Krasavin、Galina L. Starova、Andrey A. Zolotarev、Margarita S. Avdontceva、Valentine G. Nenajdenko、Aleksander V. Vasilyev
DOI:10.1039/c5ob01072a
日期:——
CF3-enones react with arenes in TfOH to givetrans-1,3-diaryl-1-CF3indanes.
CF3-烯酮在TfOH中与芳烃反应,生成trans-1,3-二芳基-1-CF3茚烷。
3-Carboxamide oxindoles as 1,3-C,N-bisnucleophiles for the highly diastereoselective synthesis of CF3-containing spiro-δ-lactam oxindoles featuring acyl at the ortho-position of spiro carbon atom
obtained in moderate to good yields with excellent diastereoselectivities under mild conditions. This work represents the first example of a systematic study of 3-carboxamide oxindoles as 1,3-C,N bisnucleophiles.